问题

There __________great changes in our hometown in the past fifteen years.
A:has been
B:have been
C:was
D:were
B:have been
C:was
D:were
正确答案是:
同类题型
Do you want to watch this video?—— No, I think it’s ____. Let’s go to the movies.
There are ________ days in a year.
Is Jack on duty today? —It ______ be him. It is his turn tomorrow.
Though we are not walking slowly, I still think that it won’t be _________ he _________up with us.
Was Kelly late for the meeting?—– Yes, the meeting _____ for 10 minutes when he _____ to the school.